Guitar bowl



FIG. 1 is a front, top and right side perspective view of a guitar bowl showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a right side eleavational view;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view;

FIG. 6 is a left side elevational view; and

FIG. 7 is a bottom plan view. 

The ornamental design for a guitar bowl, as shown and described. 